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Case hardened steel with black oxide finish. Extra thick for increased strength.

5/16&quot; Heavy Duty Flat Washer - 3/4&quot; O.D. - 3/16&quot; Thick - Steel - Black Oxide - Pkg of 10 - HDW-2

5-16-heavy-duty-flat-washer-3-4-o-d-3-16-thick-steel-black-oxide-pkg-of-10

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